Publications by authors named "Alan L Gass"

Background: The axillary artery (AX) access for intra-aortic balloon pump (IABP) as a bridge to heart transplant (HT) allows mobility while awaiting a suitable donor. As end-stage heart failure patients often have an implantable cardioverter defibrillator (ICD) on the left side, the left AX approach may be avoided due to the perception of difficult access and proximity of two devices. We aimed to evaluate the outcomes of patients bridged to HT with a left-sided AX IABP with or without ipsilateral ICDs.

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Background: Little is known about safety and efficacy of the use of Impella 5.5 compared to previous iterations in the setting of Impella with Veno-Arterial Extracorporeal Membrane Oxygenation Support as ECPELLA.

Methods: Consecutive patients who were treated by ECPELLA with surgically implanted axillary Impella 5.

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Right ventricular (RV) dysfunction and resultant acute right heart failure (ARHF) is a rapidly growing field of interest, driven by increasing appreciation of its contribution to heart failure morbidity and mortality. Understanding of ARHF pathophysiology has advanced dramatically over recent years and can be broadly described as RV dysfunction related to acute changes in RV afterload, contractility, preload, or left ventricular dysfunction. There are several diagnostic clinical signs and symptoms as well as imaging and hemodynamic assessments that can provide insight into the degree of RV dysfunction.

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Heart Failure (HF) patients are at a higher risk of adverse events associated with Coronavirus disease 2019 (COVID-19). Large population-based reports of the impact of COVID-19 on patients hospitalized with HF are limited. The National Inpatient Sample database was queried for HF admissions during 2020 in the United States (US), with and without a diagnosis of COVID-19 based on ICD-10-CM U07.

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Background: In heart transplantation (HT), peripheral veno-arterial extracorporeal membranous oxygenation (VA-ECMO) is utilized preoperatively as a direct bridge to HT or postoperatively for primary graft dysfunction (PGD). Little is known about wound complications of an arterial VA-ECMO cannulation site which can be fatal.

Methods: From 2009 to 2021, outcomes of 80 HT recipients who were supported with peripheral VA-ECMO either preoperatively or postoperatively were compared based on the site of arterial cannulation: axillary (AX: N = 49) versus femoral artery (FA: N = 31).

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Direct heart transplant from veno-arterial extracorporeal membrane oxygenation (VA-ECMO) support is challenging. Continuation of postoperative VA-ECMO support may be required in the setting of primary graft dysfunction or severe vasoplegia. We describe a simple technique to perfuse the ipsilateral leg of an arterial ECMO cannula during heart transplant while the ECMO circuit is turned off but maintaining the arterial cannula and distal perfusion catheter in place.

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Background: To describe baseline characteristics and outcomes in the largest known registry of advanced heart failure (HF) patients receiving continuous outpatient intravenous inotrope therapy. Studies evaluating the use of outpatient inotropes for palliation or as a bridge to advanced therapies were performed before current guideline directed medical and device therapy (GDMDT). There are limited data on the modern experience using outpatient inotrope (OI) therapy.

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Mineralocorticoid receptor antagonists (MRAs) are known to have a proven mortality benefit in heart failure with reduced ejection fraction (HFrEF) without kidney disease. As patients with end-stage renal disease (ESRD) requiring either peritoneal dialysis or hemodialysis were excluded in clinical trials of HFrEF, the data are scant on the appropriate use of MRAs in this population. The unknown efficacy, along with concerns of adverse effects such as hyperkalemia, has limited the willingness of clinicians to consider using MRAs in these patients.

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Pulmonary hypertension in left heart disease (PH-LHD) commonly complicates prolonged heart failure (HF). When advanced, the PH becomes fixed or out of proportion and is associated with increased morbidity and mortality in patients undergoing orthotopic heart transplant (OHT). To date, the only recommended treatment of out of proportion PH is the treatment of the underlying HF by reducing the pulmonary capillary wedge pressure (PCWP) with medications and often along with use of mechanical circulatory support.

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Introduction: Intra-aortic balloon pump (IABP) counterpulsation is a catheter-based treatment for coronary artery disease and decompensated heart failure to increase coronary blood flow and improve cardiac output. IABP is generally well tolerated, and complications are usually related to peripheral vasculature or red blood cell and platelet consumption. The usual insertion site via femoral artery renders the patient bedbound.

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The prevalence of heart failure continues to rise due to the aging population and longer survival of people with conditions that lead to heart failure, eg, hypertension, diabetes, and coronary artery disease. Although medical therapy has had an important impact on survival of patients and improving quality of life, heart transplantation remains the definitive therapy for patients that eventually deteriorate. Since the first successful heart transplantation in 1967, significant improvements have been made regarding donor and recipient selection, surgical techniques, and postoperative care.

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Background: The prevalence and contemporary trends of pre-heart transplantation (HT) coagulopathy and associated clinical outcomes have not been studied from a national database.

Hypothesis: Pre-HT coagulopathy is associated with increased in-hospital mortality.

Methods: Among 2454 adult HT recipients from the 2003 to 2010 Nationwide Inpatient Sample databases, 707 (29%) had pre-HT coagulopathy (defined as a comorbidity variable, based on International Classification of Diseases, Ninthe Revision, Clinical Modification and Diagnosis Related Group codes).

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Background: Although commonly reserved as a last line of defense, experienced centers have reported excellent results with pulmonary embolectomy for massive and submassive pulmonary embolism (PE). We present a contemporary surgical series for PE that demonstrates the utility of peripheral extracorporeal membrane oxygenation (pECMO) for high-risk surgical candidates.

Methods: Between June 2005 and April 2011, 29 patients were treated for massive or submassive pulmonary embolism, with surgical embolectomy performed in 26.

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Cardiogenic shock remains the leading cause of in-hospital death for patients admitted with acute myocardial infarction. For patients with refractory cardiogenic shock, early revascularization and intra-aortic balloon pump support are often inadequate to reverse the persistent circulatory collapse. We report 5 cases in which an extracorporeal oxygenator in series with the TandemHeart system was instituted emergently in patients with refractory cardiogenic shock from acute myocardial infarction.

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Background: Cardiac transplantation, a procedure nearly abandoned in the 1970s, has evolved into the standard of care for appropriate patients with end-stage heart failure. Much of this success has been due to improvements in immunosuppression, including the introduction of a triple-drug regimen. Retrospective reports suggested that single-drug immunosuppression with tacrolimus was feasible.

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Background: Prior retrospective studies have suggested that tacrolimus monotherapy is an option associated with excellent outcomes and reduced toxicities.

Method: We conducted a prospective, randomized, 2-center study of tacrolimus combination therapy vs monotherapy. From April 16, 2004, to September 15, 2005, 58 adult heart transplant patients were studied.

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Cardiac transplant recipients are often given prophylactic treatments to prevent opportunistic infections such as Pneumocystis carinii. Toxoplasmosis prophylaxis is commonly prescribed for transplant recipients who have not been exposed to this disease but receive a heart from an exposed donor. We reviewed the collective 28-year experience at two urban transplant programs with 596 patients, and found no cases of toxoplasmosis, but all patients received trimethoprim-sulfamethoxazole to prevent Pneumocystis pneumonia.

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Background: Conventional immunosuppression for heart transplantation is associated with various adverse effects. Tacrolimus monotherapy (TM) is an alternative strategy that minimizes exposure to additional immunosuppressants.

Methods: We retrospectively reviewed clinical data for all adult transplant recipients between January 1, 1996 and May 1, 2004.

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Background: Ventricular assist devices (VADs) are increasingly used to support critically ill heart failure patients awaiting transplantation. Previous work has focused on the Thoratec Heartmate VE device, use of which is associated with pre-formed antibody production. We reviewed our cumulative experience with the Worldheart Novacor VAD as a bridge to transplantation (BTT).

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Cardiac transplantation is the definitive treatment for eligible patients with end-stage cardiac failure. Techniques have evolved to reduce surgical mortality to under 5%. Immediate and subsequent long-term survival is more dependent on acute and chronic rejection and the complications of immunosuppressive therapy.

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Background: The Novacor implantable, electrically powered, wearable, left ventricular assist device (LVAD) has been used as a bridge to transplantation at our institution since 1994. Recent changes in protocol have resulted in a decreased incidence of infections, thromboembolism, and mortality.

Methods: We reviewed the medical records of all 43 patients who received implantable LVADs at the Mount Sinai Medical Center.

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Background: Although used for more than 20 years, optimal dosing strategies of most immunosuppressants have never been determined. Tacrolimus, one of the newer agents used in solid-organ transplantation, is gaining increasing popularity because of its ability to reverse refractory rejection in cyclosporine-treated patients and its favorable side-effect profile. As with many other immunosuppressive agents, absorption and metabolism vary between individuals, which complicates dosing.

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